created 4 classes w/ methods and made loop in main class w/ sout of s…

…tart and end work every machine

src/main/java/core/basesyntax/Bulldozer.java

@@ -0,0 +1,15 @@
+package core.basesyntax;
+
+public class Bulldozer extends Machine{
+
+    @Override
+    public void doWork(){
+        System.out.println("Bulldozer: start of work");
+    }
+
+    @Override
+    public void stopWork(){
+        System.out.println("Bulldozer: stop of work");
+    }
+
+}

src/main/java/core/basesyntax/Excavator.java

@@ -0,0 +1,15 @@
+package core.basesyntax;
+
+public class Excavator extends Machine{
+
+    @Override
+    public void doWork(){
+        System.out.println("Excavator: start of work");
+    }
+
+    @Override
+    public void stopWork(){
+        System.out.println("Excavator: stop of work");
+    }
+
+}

src/main/java/core/basesyntax/Machine.java

@@ -0,0 +1,9 @@
+package core.basesyntax;
+
+public abstract class Machine {
+
+    public abstract void doWork();
+
+    public abstract void stopWork();
+
+}

src/main/java/core/basesyntax/MainApp.java

@@ -2,4 +2,23 @@
 
 public class MainApp {
 
+    public static void main(String[] args) {
+
+        Truck truck = new Truck();
+        Bulldozer bulldozer = new Bulldozer();
+        Excavator excavator = new Excavator();
+
+        Machine[] array = {truck, bulldozer, excavator};
+
+        for(int i = 0; i < array.length; i++) {
+
+            array[i].doWork();
+            array[i].stopWork();
+            System.out.println("----------------");
+        }
+
+
+    }
+
+
 }

src/main/java/core/basesyntax/Truck.java

@@ -0,0 +1,15 @@
+package core.basesyntax;
+
+public class Truck extends Machine{
+
+    @Override
+    public void doWork(){
+        System.out.println("Truck: start of work");
+    }
+
+    @Override
+    public void stopWork(){
+        System.out.println("Truck: stop of work");
+    }
+
+}